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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd064121b84d37cc0f4e5bb310debc39fc6de81e7816b687dc9d61bc4343dfe7f' 
  AND token = 'yhWy4AuVgQXs7VsCu4GQtyOrrdMdafz6NLGA2P0EkOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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