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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21609daf22200c420e4fe7dbd84d03b2da0fd795fc26e8a3430efd3ae4443fd2' 
  AND token = 'CF9pAzm7MUVnIy8rjStpQqvT9OeD+WELK5o4ojQvBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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