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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8459c420327cc637d963924aee858057c8cd695ad4f3f4b3ecc86aacba24dad3' 
  AND token = 'N7IM8C3mq0Itrjreqb8vJ+QrAOdDsaX5lGyunPavfLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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