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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82716c15171905bf0b7c4c4e5fc655593a46f4aeba9ed089e7b6952376f908b1' 
  AND token = '24+m+J/2YIm6xkVH7/JIA3ShPzxYxaJhuonP8ArTzYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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