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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f9cb8085932cfaafdd9a786def6c316b83290ece807d533c324439dd146c2f' 
  AND token = 'LUyFbmt5h3Lbg+Tp2nMv2NkaNS6UCTbwfxoBJC9CBRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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