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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ea76f372605839a1274adb1be86800122698a59a438dc305c736a9c59ca81a' 
  AND token = '3ZhG7zz0g/UWbs/UPT63e0y0qwiJarghpUt26sLt71Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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