Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d862f0e371e34cfe0402f20f8c7ccd78356131ca49de0a6a5ade2e18e931620' 
  AND token = 'MzmWurjJCDkWHbsRfzh8T/h8pR6xVsTdaSC8wNg2B4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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