SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4005806986e7c9793452882a2ae200dd764593f4a83a0844ddd48719d4a7cd34' 
  AND token = 'Yfk5p1wDVsdhg+bPTum39Uwv9/I8qtFA/jzici55wJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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