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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6b76d48d8ad08440b5f22ed45b52cd7c61f024291782dd334f17bd91509f71' 
  AND token = 'PnRRMy7Hb/jkdZE7X9ii2DAMYWm+om2m9BYP8G8bTXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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