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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6023acb16182329b464fbca2b8d995e6073c77cc79c063f292f0234076d0498f' 
  AND token = '9c1iNZHX/NlANx2Pb+3Zch9I2V7IyJwAxdazpQtx7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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