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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd018e158fcdc84db3b0515e0422408a3c3bbf204dbc4a1e58c0aea1f5bacb3' 
  AND token = 'qz3sYYKXoRhkcs3kMRgh4mBZPrAbBbe4h2CeyLroPH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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