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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130cfce539875242eb24281c9188f7ff3cc14d68f4091b05ce0dadebba634953' 
  AND token = 'xwekcY+nvWsj7sfwwydAL49QMy+Oc1AvcxbKaMxyy/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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