SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dd058d34be556c49c1a7192f33cc5150af1731b2ef1756d8a9b6a0b97e91bc' 
  AND token = 'qbshAVPxzWHQl2R+pLfDzM/jQ3JCoZtBbiI8I7nOTEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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