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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8867f835a021be98a50af4bbb107a332c8d3a7a78c3df1ae273dce78e52c99' 
  AND token = 'zKhPYHTrWaeIH0V+wKvsWAHtq+WNhuYAY8hsxkdF7wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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