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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554a62261f3d15b6375102cfe0bb3a5fe58200f36c096a39fc9c5588fec6d776' 
  AND token = 'wDbEXP0xjEhEX43RiA8ATs0ncn+Xhdjj4zSOTSij79k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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