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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b81c5d8b6867d2c84fe9fd1f8c3e7d3ed0af7552d9ddeae399f9c3feed4e4c' 
  AND token = 'YTSzvA8Grv5aJiF9susmgxBwbxq55C8pb2BPMAzdwnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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