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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545af42a1523f013a11b542bed0db19e9bf9cca34793034ad4893289fae40449' 
  AND token = 'SCjhkssGhcnVL/QnNMa80ps4y5QWx8JSmBkFU7fzE60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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