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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e29ddb6acac8e83b820f0ef3071888fb4223154758d600622d74372143ff0f2' 
  AND token = '9X+Njbt8LgSBH+hYTgT0uQZRzYh5OEKA4a8n+uF0gIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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