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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b553c8a3e8199e195a756e9d108350f98c6156e85c0faf2a289670536e25edcd' 
  AND token = 'lfhJjrktdC8TA3xsG1YxUhU+mhBCQ5qf3gVxlufCn7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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