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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e839d54528003defd5e974aa7ac00b867a11025a36c5cdb20a95ef319ee42db4' 
  AND token = 'OpPD0ZE91FNlty5oIjUPUK8/nDUEzWwGzFwAeCM7em0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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