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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13677b2ee9cc08696828d16d40029eddc6323922ba8d61a133329de91b323936' 
  AND token = 'ztPCWg3Sqk+G6istEe+LE0N0JsquIiEmRUNCuT5rIRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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