SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f377482c2040bcbf716a469d22501acefc87bf8343ba3fb55f1566e95576e49' 
  AND token = 'qMUG0TaNfFxzKvhuQDlidB5WuV92wY8L6Xfl43QGzQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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