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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bd2bcee2fd81212a6f159d72fdef9bc2e59606fe49eb726baac1589e3717f6' 
  AND token = 'bq6ptuY9nFs0maAapZIYtdcRZIcEps0eOkZNjldmjbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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