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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e859138e0cd60327004387651a02f900c5d439cf037a03daa4bbf6a9d6514451' 
  AND token = '/dr3QSRzuqoNFlST2jVuwiCx0/o9rNNa53ljR4dFcmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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