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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f37f436d2d2e3711d98c06c9d1b9ec0ee76e2d8bcb24abb21301277bcffce4' 
  AND token = 'hrBqrerg2dcqHMzUGG6Z50VM4oGDIb7QTZJy3YxAoD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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