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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8c008a384e50fe09438d281b7a88b42768db7d361632d9b96fc8cb2594a4e8' 
  AND token = 'NGj0iWi8yaSnCGNYIbE3xGPyDlqNSM72fufCxxEk2O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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