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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a62db99cc998c7abf67ed7e872da75622670a781e07e616f70046d9d5946aa7' 
  AND token = 'lMM1ajxF3XJZITcv7OPBszC2E9amaFXGdkUO+Dppb50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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