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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f683893214d1d28e4891892a3af607a6049b21529593e6918ba638b5f8f8ae4' 
  AND token = 'NBuo4xOmqEaVEbwOdMtfKWk66bMW5q9ZAVq5/AjlvrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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