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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a0d63d1a0c99342d3ad14c627e8ba9ae5517fb801094481a895d09ded118c8' 
  AND token = 'owMkSDXqR36DLAp+T/AtBqKqcRXWgjIIh98EUb9EXJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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