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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2ffc2ce985a303bb0219e9965e756aa6c23db683bd3816451b9d5e9323dd96' 
  AND token = '47Xhw42+YtjhV9Dd5tPZLkyZMk9tbf1bkdY8CSu0/7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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