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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe468f7c756982811e2ea0c03098198a9961ba0137e418ad461fdf703d17d33' 
  AND token = 't2alUl2HumTPRauG5BBDsbHbhaedMJoHLxc8qVKu7DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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