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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9d8f511379fb5f6a94830bda270f1eed91867a6a3d3b1661aa17b9ea80633a' 
  AND token = 'JxkB1VduhmEeO10/8YHxnZdKXehNmHrJxOLjYf+wdOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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