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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94d48d6e2df34f87d73558e2af0fa3861f496261a7409ea173a3ba81bc65c98' 
  AND token = '/HrcFtoJXsiUKk140uM/GnuLvLwAhE7He6UEbiwF9xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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