SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08809edae1c20e51f92db8e469d136049160d69f5e7392583c113afe10748438' 
  AND token = 'GRr2wVwBzPdqJP/xjT1y2gAYHp8TEZeNKzBo97G62II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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