SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378233bafd6d711dcf0d70842c5afebe3f5f64c64f619dbe86a97b0a23ce5ac1' 
  AND token = 'YLadb/rR5ZZJChBTLZmxFFQdmzJmYoeoHlLLwmOHOsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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