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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549104dd308e72131d682b183109df314cd178be92ca2955b62b0fa22a1866c0' 
  AND token = 'xZEMNjbbwmI9HLfnfiYy6AbBhFjIAJWqCN6jDtcdS6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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