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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038213640a339d86bf1423ff5413d019e35b1808c7b4eeef203ffd4747e8bbfa' 
  AND token = '5LveoXJSqwIPH4E0cFthqcTkQfgG6+xvwNEOwRXge5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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