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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5e9b07f3c4baf46cff1ea0c9ef60b5958be7fa88ca9d2cbe10bce1304f6cbf' 
  AND token = '1SMGWGc8yWWKjnleuAgIK2jld7WM4oyTICFbZkzHO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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