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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e861f16639ab74895b5a9265ad4f92a637823a1dbe0c15acfce7d7b6b9cdd38' 
  AND token = 'G9INtvJGG8NyeP4y35+0uiBeRs2n+F5nZiKxC2JpS6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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