SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f2bcf7e65f6193f1b54ae1ef8bde60029b36800677d0cfd1cc52c5af22536d' 
  AND token = '/YqtHTL0mUJz/0HZmd8YDm9CaJacfqwh6oh8BAKMGaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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