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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f348e5b41a15e81c880056b9f60c42c3314a7e7ea5967d735b3fb2ae0815560' 
  AND token = 'VoSW4y0BAgcsJZKFLnsS5rMN1JiI+Gpm42W4N/Lcu3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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