SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e5cee6fc5b146ef267a1d2e3ab576c51e18f4f082947d75b9babf5d8e09fc3' 
  AND token = 'VwQnx1BuojwIw6GqvZVV046OGNn1mYbfKHvRRUhAfqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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