SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649b1f92b92eaf2fb1243674d99f765d65440b00fb36c0983b99766c5bdeedd5' 
  AND token = 'Ez1vhgL9VuvX8++UA0sP1jQ7h0rffjjwUVthLTqlj8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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