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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1f24aef6963c13e2c5f8747dba7de35cbf54e12c12c760e0f1937787bfb2db' 
  AND token = 'VWfzFGoEgOMWJIBlovCj4Z7cdT/dk1c1cfZK3tUtffA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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