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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35660ccbef29042fb6bb9f0eeb05d585e8f2a61f436a0c1ccc3ff22669a70214' 
  AND token = 'ahSqU4XtKRxk+FTDiKXVoi6P70QoF96zfzdS/MdSQtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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