Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a42b6d30e9780e64f152e30993e3ffb17c73effa973d45abe13ada29e59e34' 
  AND token = 'ga/JisTmHL+C1epcHUc2MTKOoXj5/8+Loxk6JNgrumM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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