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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3c0c21844a5b8aec30b1d36a5acf476e582b2fa406c9dc199eb89e684ee7db' 
  AND token = '7zDJIc/gplfRxVNU673WLHwCf16NLuKCBsgQ+9B9MxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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