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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccc977d893b226cbe5d17bde7579a4f2e4eb5eaea608122b8c23aa067f9170c' 
  AND token = 'yXo7BNrsos4KpMYnfHb0phf2Z6892TAX/jiMm9NOWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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