SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c17f224a616904bb669d3e08f681814b2a82e1905a534c6481031d621d57cf2' 
  AND token = 'h9uI62p/wnkr9328D9gZmHqj3gPHVjE/b7qmX+txI7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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