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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb58a522b6d39485be2a4ba3b5622e0dc668577b1378753c8ba01de33d3aa82' 
  AND token = '2ub3m/Co9xRS6UmDAmxeArQ6zQ9sLXIwhHA2jTgxjUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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