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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f3dc181d65d8b185836bf648f9bf4863d4c6fc773c0e98ab4373e9754ab36e' 
  AND token = 'YbeT5w13PdP2617ni4dRkEQelDy4cIAslM3lehgFyeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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