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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523bf2d616a3e2101737c627860df0892588d47f098e8bff57a1031b7139e648' 
  AND token = 'XuUpH68McQe4ZEkE71v177qLibtpHS7pNxEMu9iDh+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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