SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f530269e7e8c10cc7ca0f9f3765e963b32bff2a26936497bcf4b36dbf56011' 
  AND token = 'GzY5uO/Ays0GZYz9DOAwWW5jaZgTJBz1nEPV0JPftm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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