SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145bd9f79213426b793379f34e54bff6d438dd5fd98a93e2dc76837053e4da6d' 
  AND token = 'Lsw+zG0uDvxzB+hOdvVa48RLKL7rqMuYK7pBNZVeH/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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