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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab141af9738c171bb789aa60a30dd5f7865b3dc4ba1f4042cd69c6e2837215c' 
  AND token = 'tX/U8dMf16U5zPr29J8UDrwWufruCUo40nAlJFklsSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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