SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6e0795299a9c7002ec12535e9b248c2814164b013534211b6853590bd6cb35' 
  AND token = 'z5q4jiQwCpfQuWHwp+KppwkpYyhwqOVidHFz+4iEofk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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