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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a08ddfbe12b5f831847283e7464fe31f3576399c61238ca1d2d71dcef5a386' 
  AND token = 'd69F/3QnXraMfrxXif5P/9Tln3u1P1b9jcM0mcrfWLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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