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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640b0f7ff7cc71f50f916245160cebfa4fc413528507277c88b9ed1b5b8c60aa' 
  AND token = 'yY6bZBZPTwYnWvJON0tmP4P2TM/tDESKOVa+FXNxn9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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