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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8321230c66681cb243bda9b938db1250c1815e21ed62945c93653118ce5addb8' 
  AND token = 'zzQFONJgt43mgpn7MegsWHzX5evYitg6YnTjtW39ly8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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