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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffabbf4ccadf07e650bfb92cf9814f831318eb9959f5fbe024c3043d635c1b53' 
  AND token = '805KDQUG8PBnNHXnKK8AOd2PmbzTVRg7k36BUC8UjmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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