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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09e4b01ded7014977b519302f4a55e25106764e6071d725c9416b20ffab322d' 
  AND token = 'QQUHMhq1yNbDo6sANgvEH7HVvm/Z+KAytQXXmtEKzoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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