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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f593eb308aa94df48f5f2dc489668f86fc4f76bb824fa8b1454d2f8b939fe' 
  AND token = 'ydnK8OJGDamRWg00IDDW04SNlpkf0iqN+n1cyiuxduA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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