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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983d3206590e934855a2867dfb531fb00c8b3f38bc564ce379dcc4773a2675fc' 
  AND token = 'a4awdkxlr3Vxzmtix27xiDExYiUQvRtmCi44GClZ8Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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