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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83c9d1c220611fd6812baa69311b743bc4becd8c59871ad01011ab2baee7cb7' 
  AND token = 'DTYAl5azM07fjfx7onE76vWRDX5yIX9IWMhX29hnFJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}