SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea926afe5c9270acf2bdbd949afc11fed4220a7589a428c6f77bda8bff99427' 
  AND token = 'XZGpdGR5eSmeKPuz/QVeEjCIyaxfd+53XLmfjaCPXyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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