SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edabba4a415fba823e7bb8b08a1c3c658439cd31d5d0aeb9f0e82548fb1f8fa9' 
  AND token = 'i+xQRhtZk70P6F0j7+guJiGBJUpVcjNEwCkLZudezYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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