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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c062f4dcc7b4a24e63199bc08ee1eefb43235973e5d563d9d2cf268e56d6fa3' 
  AND token = 'ENnCaEsdAf1Y95jDjnvFFYMq8/RCYeEKgj61nD41FLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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