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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be28928ac2c6701c6b91a04a32eefab4334136989392031ccf3f1ace22e45642' 
  AND token = 'h9UHE2QqRWUF+7D0ZVBgbvRaKq6BUTeu9spioW/hlXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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