SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef05b59548077041c872a6aa4b2b93b32084aca86ecfa21a67b1784cf9c95ca' 
  AND token = 'LnwtfYPByZyJuFA+jMqV98+qvPN/ttKCOzkfpVlXcq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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