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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5971fab33fe7c7c7585606908f84bd96e0da4fa45e8258073a149fb34e6340cd' 
  AND token = '35mtwIULb4E3jxtx6ZkLx8a87NN5VubaoWFqEsSHLFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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