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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9099d216d98378137696f2dc50481ae75109392cd298fd22e9849f99505a33f' 
  AND token = '3pao6jDc0DXOjkmmalxZS0niVIa6mv2j1IEUx3cghOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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