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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fdaed84b654fec620153de8805b73749b419686879949d76bac593bc22a412' 
  AND token = 'BnkaunFEce54xPAPgcqUDvlO5wmM5l5XQ0EzkcvWRjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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