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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188ddea5be636595be2abb5f73164f5a23df40d43d192a47d6c07a27f5cfef49' 
  AND token = 'D96ySpKq6GmVx7Sbj0cMe26b265wn7F2qurggG2zmeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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