SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d146033d16cedd4b91fe2fd36d9272262551b388b48de5cefd9d13ba693fcc1' 
  AND token = 'YjWMViG+tVq4vHhztgzxG47BX03XozwsNW7xCcJQGEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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