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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499b4e6b7e9872d266d356d12660a5d872ca06e3d1959cabfb64d59de75e86e1' 
  AND token = '3X75IxJjPuxkTjygoABoxwhs/ztO8hJ8MysycZ0KRjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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