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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972ea150059b4f9e917eb104e5239dbfbadcba369b8fa9f45444a9acd3e9a64d' 
  AND token = '+9HsO1r5p4l8YqAYzLT/qIom0EmFZPJkjn/mMWkUPzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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