SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce7722f114fb89710812ed85f0087612e66a95eeda893c20995c8d33f6fb23c' 
  AND token = 'PtTcqRvNCu/Dzb0j75Y3ZhCGAKrHbNIu9NBsYiC7UZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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