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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e55c56abaf04f7b4d5c08851dd24f04e43b760898c037d87d8169e0ee161912' 
  AND token = '4B6gPpzL38lR8LonhLw5ALcroKM2hNdlQuwSiOim0O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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