SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e7d5f2a167bbb85e284d2afb642b77bad416904bfce305fa23b76275370839' 
  AND token = 'mXmRV65l8KA9YQVnqEGNMYpMZiLzP/f32aRgKqGtHEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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