SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4572e6d30bb0d80b8f257706b318459274952bfcafdfe037331b479fc64e3135' 
  AND token = 'v/GQVP8/JHTBceZ1RMsG6EY5FgpBiJS/9JAQGki4fYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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