SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2774f2f519d7428994b9be357a6997a8cf63b2874407b22989aa69b586873813' 
  AND token = 'wFMzUy7GPUXtIWkAVzwwJtB0jooojyDOcyuifSH/m5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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