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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27442db5cd6cb67ddd71cc3941a3623fb1c120ecd8d9d55796427d6bc222a428' 
  AND token = '6eKB13wzhEBO6bp/Qn3Fzul53FcBIwmyxwmeod7XA5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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