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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2101eb83e3bb6dc5207457960893ef540181a5bdf91a839322124aba3027ec' 
  AND token = '/ckx+bkppjccnE3qU6U4WkNoTv9uN0dMV8Fq0VFts7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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