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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014a701afd22a63ff934903819e68e99bd15694eeb7c8a76e7735a45e0e626fb' 
  AND token = 'O4qAasQ6EuGypjBfT/NcYQK6/Tz7y7b8hbTKb/IlYVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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