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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cde4dc7ce20900f10f61ac9b9584f55495032ce2aa47fc4939286f38ea3df6' 
  AND token = '6ZP4y+LrsHDJosOnecl/dlRXcSn32S9h/0sTcHt8KAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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