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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e5bd874baeccb4e99cb6de753642c21b7a6cacfec726da6b11b9317abe830b' 
  AND token = 'd1ydr6WZRBgKPgoCwKo8/A4z8JHxaNeT8UzY8r5rpeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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