SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fafabb8980512128e1e6beb395cb39f1b83e30a4dbbe44a8079088256a57561' 
  AND token = 'hsVqBJjFFLCQE1SRU9VyB/vXRlYIshxJIH9+pfxfBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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