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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f084f505569cd816fd43b86944ed443ebc7f3c01c10daa6d506bf55e2510acc5' 
  AND token = 'vSW3tzOwnWpRUxnAflOy5npPSuEIUVqEHX9CQ1kcV00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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