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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8368c1dddef5eb648ebba7647674234d08b22df77d9c32da4205fbacbc29153f' 
  AND token = '8EurLTX1hYulbixLFdG2bm5zz6jjXJAAnEeYnNnKUH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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