SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd02f7b9e9618efcfc64af1ae6727783d5b12a637d2afc12e11d4c6f8c0c485' 
  AND token = 'eVbR8z2mZjw+Fxaa4ueHh/65p91FRdPYthpBunuJ3TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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