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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ab142245a7873edcd03fe0e4ed62eb387a929d6de68a04dfce982d9bebcbd9' 
  AND token = 'dIWi5URx/I1K+F8aSslcXuuDDEIyMs2sa1J7fIKra1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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