SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52fa6852914e5fcdc43d5266949e55b4cc06d6457de1f280c9ba27ee97a029e' 
  AND token = 'OJnipqDPuV1Yp9Y+Oxo1/T5jU2gsIDwW0Cj+pMYt/gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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