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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8deccdc975c197d8ce244ce47e951fc516bc34a2e04c673fa817593166b8651' 
  AND token = 'hKFVTX6wdj4f+aG/Wf8YeiWRBO61PNtqUKFTtcKBtoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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