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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b71c14bce5950d06f3da8f8a815c49af7ce57079631cdf35e3d24490863103' 
  AND token = 'Wd2Gz1M3hDKoXMQyG/6dn79f2Z7dEKL3/KuQwE17CrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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