SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f97d24ddc62d9c97cf2b44a6d562511c84052c28a785ca2aaffe40e5df01c4c' 
  AND token = 'zOusjIqEM7sx+s5bY3Jw65j6iS/oi+gzADQMSG/KOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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