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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889bb200bf59dfe77f8434f21e093f79598bb8771312828928632c50c0221a57' 
  AND token = '0UB0WG77nkaMSm9NvklWEjCZ6miuObunJ3DxEZ/+hVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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