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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9aed1471cf77dabd002b5a4fa40801294d55dab963fd283872e59b22771849' 
  AND token = '9v3vRto3kFttA56C9GAbj1hhHmpey7CeE95LS65sdkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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