SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69f577b70de2f26c6ee188f7654f9932043d8c48a51946dc13a8302b9a81b1d' 
  AND token = 'NotKvQqmBClRcqiCNZ0Whdnm1T2oElzk/pbU+Uov4dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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