Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53048ef27e7446347d988bfe504f76cc5904fb78f44cd9ecfbbd284c43c1aa75' 
  AND token = 'vKO4rWo0RqXKJdEqnge3H072IcvbYfKs31kbHSmIhPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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