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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202d0b3d6dfb90ce1404d6cfa176f9cab6b3c33debdb814a61c413a52ea5f92d' 
  AND token = 'bNfjFQXI0p6uHef45/dmZncm7k6VhD8JdoQZTBThlUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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